Detection of vibrations

Any organism that has receptors to detect incoming vibrations can hear and gather information about their surrounding environment.

Insects	Fish	Mammals
Varies depending on insect but often very high frequencies. Moths, cicadas and grasshoppers have tympanic membranes on their abdomen to detect sound similar of that to the human ear drum. Mosquitoes have hairs on their antennae, which detect minute vibrations in the air. Bees, ants and termites have mechanoreceptors on their legs, which detect sounds travelling through the ground.	Ears are located inside their body. 2 internal ears filled with fluid and lined with cilia. The cilia detects movement of fluid within ear caused by vibrations. Some fish also have a swim bladder filled with air which is able to detect sound.	Ears located on exterior of body. Consists of three main sections. The external ear, where vibrations are collected. The middle ear, to transmit the vibrations. The inner ear where the cochlea receives the vibrations and converts them into electrical impulses. Similar within all mammals both terrestrial and aquatic.
Vibrations heard through Air and solid-ground. Contains Tympanic membranes, hair cells and mechanoreceptors.	Vibrations heard through water. Contains swim bladders, internal ears, lateral line systems, neuromasts and hair cells.	Vibrations heard through air and liquid. Contains cochlea, hair cells and organ of corti.

Aubusson, Eileen Kennedy Peter. Biology in Context: the Spectrum of Life. Victoria : Oxford Uni. Press., 2001. Print.
"HSC Online." NSW HSC Online. N.p., n.d. Web. 25 June 2010. <http://www.hsc.csu.edu.au/biology/options/communication/2952/CommPart4.html#1>.